The following is a brief summary of some of thoughts said over by R' Frand on the parsha this evening. I have attempted to reproduce these vorts to the best of my ability. Any perceived inconsistency is the result of my efforts to transcribe the shiur and should not be attributed to R' Frand.
R' Frand began his vort by referring to Avraham being told to leave his homeland in the beginning of Parashas Lecha Lecha. R' Frand quoted the Rishonim who say that even an Avraham needs to be concerned about being influenced by negative surroundings.
R' Frand then applied this to two incidents in this week's parsha. When the angels visit Avraham the Torah states in Bereishis 18:8 - וַיִּקַּ֨ח חֶמְאָ֜ה וְחָלָ֗ב וּבֶן־הַבָּקָר֙ אֲשֶׁ֣ר עָשָׂ֔ה וַיִּתֵּ֖ן לִפְנֵיהֶ֑ם וְהֽוּא־עֹמֵ֧ד עֲלֵיהֶ֛ם תַּ֥חַת הָעֵ֖ץ וַיֹּאכֵֽלוּ. Rashi explains that the angels did not actually eat, it only appeared as if they ate.
Later in the parsha, the angels visit Lot in Sodom. Again they are given food and the Torah writes in Bereishis 19:3 וַיַּ֤עַשׂ לָהֶם֙ מִשְׁתֶּ֔ה וּמַצּ֥וֹת אָפָ֖ה וַיֹּאכֵֽלוּ. This time Rashi does not write that they only appeared to eat. R' Frand quoted the Sefer Pardes Yosef who cites the Gaon M'Lutsk and it is also hinted in the Zohar, that the angels ate. How did they eat? They sunk from the level they were on when they visited Avraham. This sinking was because they were in Sodom which was a truly toxic environment. We thus see that even angels can be influenced by their surroundings.
R' Frand noted that we see that the angels had sinned as the Torah writes in Bereishis 19:3 that the angels told Lot - כִּֽי־מַשְׁחִתִ֣ים אֲנַ֔חְנוּ אֶת־הַמָּק֖וֹם הַזֶּ֑ה. Later in Bereishis 19:22, the angel tells Lot מַהֵר֙ הִמָּלֵ֣ט שָׁ֔מָּה כִּ֣י לֹ֤א אוּכַל֙ לַעֲשׂ֣וֹת דָּבָ֔ר עַד־בֹּאֲךָ֖ שָׁ֑מָּה - that he could not do anything until Lot left. Rashi comments that this was a punishment because the angels had previously said כִּֽי־מַשְׁחִתִ֣ים אֲנַ֔חְנוּ - that we (and not Hashem) will be destroying Sodom.
R' Frand quoted from Yechezkel wherein the Targum says that the sin of Sodom was Gaavah - people were haughty. This impacted on the angels, as the Rabbeinu BeChaye says that angels don't have a Yezter Harah, but they do stray as they can be influenced.
R' Frand also noted one other example of the angels falling on a spiritual level. The Torah writes in Bereishis 19:16 - וַיַּחֲזִ֨יקוּ הָאֲנָשִׁ֜ים בְּיָד֣וֹ וּבְיַד־אִשְׁתּ֗וֹ וּבְיַד֙ שְׁתֵּ֣י בְנֹתָ֔יו. Why were the angels holding the hands of Lot's wife and his daughters? This was not to save their lives as the angels could have saved them without making physical contact! R' Frand answered that the hallmarks of Sodom were haughtiness and immorality and it impacted the angels. R' Frand quoted R' Yitzchak Mirsky in Higyonei Halacha that the angels slipped because they were in an environment of Gaavah and Zenus. And Gaavah leads a person to become less careful and more likely to stray and be unfaithful.
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